Scaffold jack



Apr. 24, 1923.

H. c. WER-rz SCvAFFOLD JACK Filed Feb. 20. 1922 3 Sheets-Sheet l H-C-WERTL Apr. 24, 1923. 1,452,717

` H. c. WERTZ l SCAFFOLD JACK l Filed Feb. 20, 1922 3 Sheets-Sheet 2 9&1?! MMWWWW H. C. WERTZ SCAFFOLD JACK Fued Feb. 20, 1922 5 sheets-sheet IS wuamtoz Patented pr. 24, i923. l

rasant t, HAEVEry c. wER'rz,.-.0E HOMESTEAD, PENNSYLVANIA. t

I f scAEEoLD JACK.

' Application mea rebi-lafyao, 14922. sriai Nb. serez/iff Y To. all when?, t may] concern.'

Be it .known that I, HARVEYC. VVERTZ, a citizen' of Athe United States, residii'ig-` at Homestead,` in the ,county of Alleghenyantl v State ofA Pennsylvania, ,have .invented cerf tain .new andjusei'ul Improvements in Scaffoldf'lacls, of. which the following'is ,ication s v y VThis invention relates to adjustable sup.- .poyrting jacks forv scaii'ok'ls and has for van object to provide a support for scaffolding .that can befreadily adjusted to supportvtlie scaffolding at different heights, whichcan be "readily taken yapartvin taking down the scaff- Afolding and` readily assembled to` receive'a supporting platform. to. provide an adjustable scaffold'supporting. vframework built up of ytriangular ad -justable frames which can be adjustably joined together to form an adjustablejilat'- formr supporting stand or which canbeseparately attached lto ya wall yor root'to lform platform supporting brackets., @therebjects will .be apparent lfrom thefollowing description in connection withthe annexed In said annexedidrawings: Fig. l is ran end elevation of a scaffold inwhich theirnprovedv jack is employed, showingy thefjack -i n side-elevation with portions broken away vto show certain parts insection. Fig. Q is an `end eleva-tion ofthe scaffold showing in full .lines-, the parts of the jack fullv telescoped and supporting the "plat-` lines-the jack extended and supporting the platformy in an elevated position.y t F ig. 3 is a perspectivefview. of. a pair ot j acks' set up and` connected by bracing ,niembers ready to receive the platform.- Figjli isa sile ytriangular frame ofthejack, detached,y y f Figffis a side elevation of thelower triy angularframe of the jaclgdetached. y

onevo'f the adjustable triangular frames used ingpa'rt of a platform supportj.

A` further, object is bars..

.formzin lowermost position, and i'n dottedV levation (of the Hupper t t l bular or solid, pivotallv connected vbetween r rthe ianges of the lbar ,3 yby means of-'the fF-ig.'6 isa View showing in side elevation frames attached to a verticaly wall and liorrn- `Fig. 8 is a horizontal `sectionaloview rtaken PATENT/o online 8 8 of Figf': flig.l y9 isfafdetail view showing in elevation vthe pivotal coni nection betweeiitlie Acl1 `an `nel platform vsupporting rmemberr ,of the upper; triangular frameand the adjustable brace together withv `the anchoring Lclevis 'carried'by the pivot pin. l F1g..10 is ak detail `view"showingin `elevajustable bracey bar 'of thel upper frame'and "tion the pivotal connectionbetween they adthe channel sidebar thereof together "withv .the v'stop ,pin for' holdingthe channel'side bar |`of the' upper'framein adjustedposit-ion on the'channel side bar of thelower frame. -Fig 11 isa detail view showing in eleva- Fig. l'is a sectional detail rview'ta'ken on tionfthejk pivotal vconnection between` *the channel base bar and channelsidebar-ot the line`13-13 of Fig. lf lTigQlt:isasectional-y View `corresponding'to'.jlig. 12 showing a modliied `construction of the side'and brace Referring to the. annexed drawings, "the improvedscatfoldjack-consists-oftwotriangular frames adjustablyand detachably connected. The: lower frameiconsistso a channel base bar l, having'its -langes 2feX'- tending upward'ly; a channel side. bar 3a'rranged with its channel ,facing inwardly; and pivoted at its lower end between the .flanges 2 of the base bark 1 oiia Apix'fot-'pi-n 4f,extending throughthe lflanges Qfo'fthe base bar;v and an extensiblebracebar connecting the free ends 'of ther'zhannelbars.l and'y 3,

consisting of a tubularvbar 5 vpivoted on a transverse pivot-pin 6 between the Liiang's, 2

ofthe bar l and abar 7 whichmay be tutrally disposed apertures? y.adapted t register with similarly ldisposedapertures in the v'bars in adjusted position.""'Pi/Votal`ly connected with the 6` outside the'anges 2 sapeva u which is Married.- to receiveleo an anchoring stake driven into the ground or may be used to anchor the frame to a vvertical wall as will be hereinafter described.

The base bar lha's a series of nail holes 12 in the web thereof to enable the bar to be nailed to a floor, roof or wall.

The upper triangular frame consists of a channel baise bar 13 arranged, when connect- .ed with the lower frame as shown in Fig. 1, with its channel fac-ing downwardly; a chan-- transverse pin 17 and a bar 13 which may beftubular or solid,lit's slidably within the tubular bar 16 and is pivoted between lugs 19 suitably secured toy thel back of the channel bar 14. y,The bar 18 has a series of aper-f tures 20 ladapted to be brought into register' lwith similar apertures inthe bar 16`and to receirf'eV a. pin `21 to4 lock the barsl inthe dekrsired adjusted position. The pivot-pin 17 at the inner endA of the bar 13 carries a clevis 22 by means 'of which the upper end of the Y. jack may be anchored to a wall. A. portion of the webf of the bar 13 is cut away at the outer end thereofand the upper end 23 of the sidebar 14 projects abo-ve the upper surface of the bar 13. tthe inner end thereof, the bar` 13 has a U-shaped brace rail receiving strap or stirrup 24 riveted to the .webthereof The lstrap 24 isadapted to re- 'ceive al transverse brace rail 25 which eX- rtends across to a. second supporting jack.` Nail holes 26 are provided in the strap 24 .whereby the brace rail'25 may be secured in place. Planlrs 27 are laid across the top `of the rails 13 of two or. more jacks and form 'the platform upon which the workmen stand. The planks 27 are prevented from beingrfaccidentally: pushed .off the` supporting jacks by theends 23 of the bars 14 at i the outer end of the bar 13 and by the brace rail receiving straps 24 Aat the inner end of the bar 13. Tothe inside of the side bar 14 ofthe upperlframe immediately beneath the platform supporting bar 13 is attached a U- shaped rail receiving strap 28, similar to the stra-p 24 on the rail 13, adapted to receive a transverse brace rail4 29 and provided with nail holes 30 whereby the rail 29 may be secured against'longitudinal movement therein.

Asshown in Fig. 12 the channel side bar -14 of theupper `frame is of a size to lit over the channel side bar 3 of the lower frame and kthe side flangesthereof have short inturned edge flanges 31 adapted to engage the outer edges of the flanges of the bar 3 and providing between them a slot for the bar 7 of the lower frame which is pivoted between the flanges of the channel bar 3. The lower end of the channel bar 14 being open and the interior of the channel unobstructed, the bary 14 is adapted to be slipped upon the end of the bar 3 to adjustably unite'the twoy triangular frames. The bar 3 is provided with a series of apertures 32 adapted to receive a vpin 33upon which the lower end of the channel bar 14 rests and by means of which the upper frame may be supported at different elevations on the lower frame. As indicated in Fig. 2 the platform supporting frame can be raised to the desired elevation with respect to the base frame and secured in such yadjusted position by placing the pin 33 in the proper aperture in the bar 3 andthe pins 10 and 21 in the proper apen tures in the bars 9 and 13,` respectively.

The adjustable brace bars ofthe two triangular frames provide means for independently adjusting the angle of the base bar 1 and platform supporting bar 13 with respect Ato the diagonal telescopically con- 'f nected bars 3 and 14. Thusr if the "scaffold is set up upon sloping or uneven ground the base bar f1 `can be set on angle with respect to the horizontal corresponding to the of the scaffold may have their bases sloping Aat dierent angles.

upper frameuntil the channel side bar 14r of the upper'frame slips off of the channel side bar 3 of the lower frame. As shown in fFig. 3, whenth'e jacks have been set at the desiredy height, diagonal brace bars 34, and 35, maybe nailed to the brace rails 29 adjacent their ends, to each other at their crossing point and placed with their lower ends inthe channels of the bars 1 to hold the jacks against lateral movement.' y

As yshown in` Fig. 6 the base frame may be used as' a jack for roof scaffolding. Vilhenvso used, the bar 1 isnailed through the openings, 12 in the web thereof to a slopingroof 36 and the bar 7 kis adjusted in the tubular bar 5 to bring the channel side bar 3 into horizontal position to support the planks 37y forming the platform. j

' As shown in Figs. 7' and 8 the lowerframe member maybe secured to a vertical wall and serve as a platform supporting bracket. For this purpose the clevis 11 is slipped between a pair of weather boards and a. key 38 inserted therethrough. The base bar 1 may be nailed to the wall through the openings 12 if desired. 'The bar 7 is telescoped into the tubular bar 5 and secured in aposition in which the bar' extends at a right angler to the bar 1. When so positioned the side bar 3 becomes the brace bar and the ,slope of the ground and the separate jacks bular bar'. The end of the bar 3 .projects the bar 14.

slightly yabove the bar 5 andA forms a stop 3 maybe replaced byaV pair of angle bars 3 arranged with their 'angles facing inwardly and fitting slidably over a T bar 14K-replacing the channel sidebar 14.. The ilianges of the angle bars 3,-are retained liii-engagementv With the flanges of the T bar 14 by means of transversepins 40 secured in the Web of The brace bar 7 is pivotally secured to the bars 3 by means of a transverse pin 8. r

` What I claim, is: i j

1. A scaffold jack, comprisingk a pair of triangular supporting frames, :each consisting of a basebar and a side bar of fixed length pivotally connected together atone end and a two part telescopic brace'pivotally co-iinected to the free ends of the vbase and side bars, the brace bar'of one of said triangular frames-being formed to fit telescopically over the side bar of the other triangular frame; means forsecuring said telescopically connected side bars in different adjusted positions; and means for securing the telescopic parts o-f -said braces in different adjusted positions. 1

Q 'A scaffold jack, comprising a pairof reversely-related triangular frames, each frame having three sides pivotally connected and one of the sides adjustable to different lengths, and one ofthe side members of one of said frames beingtelescopically and adjustably connected With'a side member of the other of said frames. v

3. A scaffold jack, comprising a-pair of triangular frames one fof the side members l of one of said frames beingdetachably, telescopically and adjustably connected With aside member of the other of said frames, each of said frames having a side member of adjustable length connected with the telescoping portions of said telescopically con- `nected side members. i f s LA scaffold` jack, comprisinga `pair of triangular frames, each consisting of a channel base Vmember and a channel side bar pivotally connected at their ends, and an eX- tensible telescopic brace :connecting their free ends, the channel side bar of one frame being of a size to fit telescopically over `the "channel side barofthe otlierfframe; and

means for securing` said telescopically fit- `ting channels in different adjust-ed positions.

' 5. A scaffold jack, comprising, a base member; a platform supporting member; an extensible brace member extending diagonally from one lend of the base vmember to the opposite end of said platform supporting member; means for adjusting the angle between said base memberand said diagonal member; and independent means for adjustthe angle fbetjveenvsaid platform I sup-- portingmemberflandsaid diagonal member.-

- 6: AAil scaffold ack comprising basey mem vbei" g a platform supporting finemberf; a tele cscopic` two@ part .brace member extending di agonally z from one end .ofthe base. member to the opposite end vof said platform supporting member; aux-iliary*y brace :members y.eX-`v tending from said diagonal bracememberto.

the base and platform supporting members respectively; and transverse brace securing means carriedby saidl platform supporting n member and diagonal brace member, respectively.

7. A scaffold jack comprising a base member; a platform supporting member; an

extensible brace member extending .diago-.

nallyfrom one end of the base member to the opposite end of said platform support# ing member and auxiliary `adjustable members connected to said base member and'platform supporting members, respectively' and to said diagonal brace member. n y l 8. A scaffold jack comprisinga base mem ber; a platform supporting member; an extensiblebrace member extending diagonally from one end of said base-ii'ienrber and; ro-

jecting above said member; auxiliary adjustable brace members connected to said diagonal brace member and to said base member and platform supporting members, respectively;- and a transverse brace receiving member secured to the upper face of said platform supporting member ony the end there-of opposite that to which said diagonal brace is connected.

9. Ina scaffold jack,r atriangular supporting framecomprising a channel base bar;

brace bars pivotally'connected kWithin said channel at opposite ends of said base bar and pivotally connected to each other at their outer ends;lone of said brace bars beingmade of tivo telescopic extensible parts; and an anchoring clevis pivotally attached to said channel base v member at one vend thereof. n

j 10. In a scaffold jack, a triangular -supporting frame, comprisinga channel base bar; and brace bars pivotally j connected Within saidchannel at opposite ends of said -base bar and pivotally connected to keach otherat their outer ends, onerof said brace bars being made in tivo telescopic parts havingfregistering openings for locking devices, j and said'channelbase bar having nail holes iii the web thereof land a clevis pivotally connected to the end of one of ksaid bars.

11A Vscaffold jack, comprising a pairy iio nel vfaeing outwardly-andthe extensible side barfof the frame Connected t0 the back o'i i said channelY bai', said channel side bar, `0'1" said second frame being adaptedtotelescopically receive the'channelside bai of the irst frameg-Vand means for securing said telescopcally connected channel bars in difyferent adjusted positions.

In testimony `whereof I affix my signature in presence of two Witnesses.

, y 'HARVEY of WERTZ.

i' \Vtnesses:

GUY W. RAYMAN, VILLIA-M C. VVICKERHAM. 

